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Adaptive radiation Single species evolves into several different forms that live in different ways Single species evolves into several different forms that live in different ways
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Chapter 17-4: Patterns of Chapter 17-4: Patterns of EvolutionEvolution
Essential Question:Essential Question:What are 5 important patterns of What are 5 important patterns of macroevolution?macroevolution?
Mass extinctionsMass extinctions Several mass extinctions shown in fossil Several mass extinctions shown in fossil
recordrecord Effect is to leave many habitats open for Effect is to leave many habitats open for
surviving speciessurviving speciesOften a burst of evolution follows mass extinctionsOften a burst of evolution follows mass extinctions
Adaptive radiationAdaptive radiation Single species evolves into several different Single species evolves into several different
forms that live in different waysforms that live in different ways
Convergent evolutionConvergent evolution UnrelatedUnrelated organisms that look remarkable organisms that look remarkable
similar to each othersimilar to each other Cause is both species are evolving in similar Cause is both species are evolving in similar
environmentsenvironmentsSelection pressures are similar on traitsSelection pressures are similar on traits
Ex: sharks and dolphinsEx: sharks and dolphins
CoevolutionCoevolution 2 species evolve in response to changes in 2 species evolve in response to changes in
each other over timeeach other over time Ex: Ex:
flowers & pollinating animalsflowers & pollinating animalsPoisonous plants & resistent insectsPoisonous plants & resistent insects
Punctuated equilibriumPunctuated equilibrium Modification of Darwin – he was a Modification of Darwin – he was a ““gradualistgradualist”” Fossil record indicates long periods of little Fossil record indicates long periods of little
evolution evolution ““punctuatedpunctuated”” with periods of rapid with periods of rapid change in specieschange in species